117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2018 Microchip Technology Inc,
|
|
* Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/of.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <soc/at91/atmel-sfr.h>
|
|
|
|
#define I2S_BUS_NR 2
|
|
|
|
struct clk_i2s_mux {
|
|
struct clk_hw hw;
|
|
struct regmap *regmap;
|
|
u8 bus_id;
|
|
};
|
|
|
|
#define to_clk_i2s_mux(hw) container_of(hw, struct clk_i2s_mux, hw)
|
|
|
|
static u8 clk_i2s_mux_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct clk_i2s_mux *mux = to_clk_i2s_mux(hw);
|
|
u32 val;
|
|
|
|
regmap_read(mux->regmap, AT91_SFR_I2SCLKSEL, &val);
|
|
|
|
return (val & BIT(mux->bus_id)) >> mux->bus_id;
|
|
}
|
|
|
|
static int clk_i2s_mux_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct clk_i2s_mux *mux = to_clk_i2s_mux(hw);
|
|
|
|
return regmap_update_bits(mux->regmap, AT91_SFR_I2SCLKSEL,
|
|
BIT(mux->bus_id), index << mux->bus_id);
|
|
}
|
|
|
|
static const struct clk_ops clk_i2s_mux_ops = {
|
|
.get_parent = clk_i2s_mux_get_parent,
|
|
.set_parent = clk_i2s_mux_set_parent,
|
|
.determine_rate = __clk_mux_determine_rate,
|
|
};
|
|
|
|
static struct clk_hw * __init
|
|
at91_clk_i2s_mux_register(struct regmap *regmap, const char *name,
|
|
const char * const *parent_names,
|
|
unsigned int num_parents, u8 bus_id)
|
|
{
|
|
struct clk_init_data init = {};
|
|
struct clk_i2s_mux *i2s_ck;
|
|
int ret;
|
|
|
|
i2s_ck = kzalloc(sizeof(*i2s_ck), GFP_KERNEL);
|
|
if (!i2s_ck)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &clk_i2s_mux_ops;
|
|
init.parent_names = parent_names;
|
|
init.num_parents = num_parents;
|
|
|
|
i2s_ck->hw.init = &init;
|
|
i2s_ck->bus_id = bus_id;
|
|
i2s_ck->regmap = regmap;
|
|
|
|
ret = clk_hw_register(NULL, &i2s_ck->hw);
|
|
if (ret) {
|
|
kfree(i2s_ck);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return &i2s_ck->hw;
|
|
}
|
|
|
|
static void __init of_sama5d2_clk_i2s_mux_setup(struct device_node *np)
|
|
{
|
|
struct regmap *regmap_sfr;
|
|
u8 bus_id;
|
|
const char *parent_names[2];
|
|
struct device_node *i2s_mux_np;
|
|
struct clk_hw *hw;
|
|
int ret;
|
|
|
|
regmap_sfr = syscon_regmap_lookup_by_compatible("atmel,sama5d2-sfr");
|
|
if (IS_ERR(regmap_sfr))
|
|
return;
|
|
|
|
for_each_child_of_node(np, i2s_mux_np) {
|
|
if (of_property_read_u8(i2s_mux_np, "reg", &bus_id))
|
|
continue;
|
|
|
|
if (bus_id > I2S_BUS_NR)
|
|
continue;
|
|
|
|
ret = of_clk_parent_fill(i2s_mux_np, parent_names, 2);
|
|
if (ret != 2)
|
|
continue;
|
|
|
|
hw = at91_clk_i2s_mux_register(regmap_sfr, i2s_mux_np->name,
|
|
parent_names, 2, bus_id);
|
|
if (IS_ERR(hw))
|
|
continue;
|
|
|
|
of_clk_add_hw_provider(i2s_mux_np, of_clk_hw_simple_get, hw);
|
|
}
|
|
}
|
|
|
|
CLK_OF_DECLARE(sama5d2_clk_i2s_mux, "atmel,sama5d2-clk-i2s-mux",
|
|
of_sama5d2_clk_i2s_mux_setup);
|